rover

US /ˈroʊ.vɚ/
UK /ˈroʊ.vɚ/
1.

a person who spends their time wandering.

:
•
they became rovers who departed further and further from civilization
:
wanderertravelerglobetrotterdrifterbird of passageitineranttransientnomadgypsytrampvagrantvagabondhobogadabout
2.

(in various sports) a player not restricted to a particular position on the field.